APT, a Command-line Wrapper

apt may be thought of as a traffic cop
that directs commands to the appropriate tool,
automatically elevating itself with sudo if need-be.
It consolidates all commands from apt-get and apt-cache,
and the most common from
aptitude, dpkg, dpkg-query,add-apt-repository, and apt-key.
It has a much narrower focus than "kitchen-sink" tools such as wajig.